DS1834D

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The DS1834D Supervisors from Texas Instruments is a linear circuit designed to provide flexible options for monitoring and controlling device power supply systems. Designed for use in mobile phones and other portable devices, the DS1834D features a wide input voltage range, a high-current voltage monitoring pin, and several optional exception detection functions. As such, the DS1834D can be used to provide power supply monitoring, overvoltage and undervoltage protection, overcurrent protection, and a variety of fault monitoring functions. This article explores the application field and working principle of the DS1834D.

Applications

The DS1834D is suitable for use in mobile phones, personal digital assistants, portable gaming systems, and other handheld devices, where a flexible combination of voltage and temperature monitoring, as well as programmable overvoltage/undervoltage protection, is required. It can also be used in data networks and servers, and other applications where precision power supply and monitoring are key requirements.

The DS1834D features an input voltage range between 2.7V and 16.5V, and a maximum quiescent current draw of 140µA. It also has an 800mA voltage monitoring pin, which can detect voltages up to 16.5V and signal an overcurrent condition. In addition, several digital output pins are available, including an overcurrent/undervoltage pin, as well as separate OVP and O/U pins.

Other features of the DS1834D include programmable power-on reset and voltage alert thresholds, adjustable timeout delays, and an adjustable thermal shutdown threshold. The voltage alert and thermal shutdown thresholds can be adjusted to accommodate different operating conditions and provide more precise control over the device’s power supply.

Working Principle

The DS1834D supports a wide range of operating conditions, enabling it to be used for a variety of applications. On power up, the device monitors the voltage on its input and output pins for the presence of an overvoltage or undervoltage condition, and will respond accordingly. It does this by comparing the input and output voltages, and if the difference between the two is greater than a set threshold, the device will activate its overcurrent and undervoltage monitoring pins. If the difference is within the set threshold, normal operation will be resumed.

The DS1834D can be configured to respond to an overcurrent condition in one of two ways: by activating a voltage alert pin or by activating a reset pin. The voltage alert pin can be used to signal a device controller that an overcurrent condition has been detected, allowing corrective action to be taken, while the reset pin will force the device to shut down in the event of an overcurrent or undervoltage condition. Another feature of the DS1834D is its adjustable timeout delay, which can be used to ensure that OV/UV faults do not persist for too long without being corrected.

The DS1834D also supports an adjustable thermal shutdown threshold, which can be used to shut down the device in the event that the device becomes too hot. This can help to protect the device from overheating and prevent damage to sensitive components.In addition to these features, the DS1834D also supports several optional exception detection functions, including battery management, system power-on reset, and watchdogs.

The DS1834D is a versatile and powerful linear supervisor, providing a wide range of options for monitoring and controlling the device power supply system. With its wide input voltage range, high-current voltage monitoring pin, and adjustable timeout delays, the DS1834D is well-suited for use in mobile phones and other portable devices.

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